Balanced slide-valve



(No Model.)

J. E. SWEET.

BALANCED SLIDE VALVE. No. 268,055. Patented Nov. 28, 1882.

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UNITED STATES PATENT OFFICE.

JOHN E. SWEET, OF SYRACUSE, NEW YORK.

BALANCED SLIDE-VALVE.

SPECIFICATION forming part of Letters Patent N 0. 268,055, dated November 28, 1882.

Application filed November 8,1880. (No model.)

To all whom it may concern Be it known that I, JOHN E. SwEE'r,-of Syracuse, in the county of Onondaga and State of New York, have invented newand useful Improvements in Balanced Slide-Valves, of which the following is a specification.

This invention relates to certain improvements in that class of inventions known as balanced slide valves, and which are balanced or supported between the seat and a cover-plate and are generally of rectangular form; and theinvention consists in combining ledges or projections in the exhaust channels or passages and in such relation to the exhaust-openings that a double passage-way on each side of the valve is formed to properly control the exit of the exhaust-steam, and thereby prevent the cutting or wearing away of the cover-plate by the action of the steam on it, as has heretofore been the case.

Figure 1 is a vertical section and longitudinally through the valve and its seat and cover; and Fig. 2 is a plan of the valve, with a portion of the cover broken away to show the openings.

At A is shown the seat. 7

B is the-valve, and U the cover-plate.

D are the bearing -ribs for supporting the cover, and they also serve as guides for the valves. y

E and E are the ledges in the exhaust-passage-way to assist in protecting the coverplate.

F and F are the ports, and G and G are the steam-channels from the ends of the cylinder.

H and H are channels in the cover-plate, through which a portion of the exhaust passes and escapes between the ledges and the coverplate. For example, as the valve is.represented in the drawings part of the exhaust passes out through the opening at F and through the channel at H in the cover-plate and around the ledge atE, and there meets the other portion of the exhaust on the other side of the ledge, and thus counterbalancing the action of the steam on the under side of the cover-plate; but it is evident that the steam begins to exhaust through the opening at F and out through the channel H in the coverplate, and then as the valve moves the exhaust is divided, as shown.

I therefore claim- In a slide-valve for engines, the combination of the passages F and F, channels H and H in the cover-plate, and the ledges E and E for deflecting the exhaust-steam, as hereinbefore set forth.

In testimony whereof I have hereunto set my hand and seal in the presence of two subscribing witnesses.

JOHN E. SWEET. 

